Use this unusual tonic syrup to make a perfect cocktail. Mix it with your favorite booze (we'd recommend something light, like blanco tequila or gin) and some seltzer and you've got a refreshing drink in a matter of seconds. Combining lemon and lime juice with charred grapefruit peels and cinchona bark, aka quinine, this is not your grandfather's tonic. A touch of Bulls Bay sea salt brings everything together. Made in South Carolina by Bittermilk.